Cheating in poker?
Playing poker on the Internet seems to provide cheating possibilities and cheating does exist. The most common way to cheat in online poker is to co-operate with some other poker player sitting on the same board, this is called collusion.
On the other hand, the poker rooms are very aware of this and protect (if it's a serious poker room) the players from cheaters with effective methods.
It should also be said that this is not a very common phenomenon, neither is it obvious that two players who are cheating always wins.
Therefore, you shouldn't be all too worried about the risk of losing because you get cheated online. If you still suspect that it has occurred, you can report the hands (all hands are numbered) to the poker room that you suspect were inflicted by unfairness.
In recent times another method that being used are DDOS attacks. It can be used by a player in a heads-up match for example. When a big pot has arrived the cheating player makes a bet (with the weaker hand) and at the same time attack the opponent's computer. If the DDOS attack succeeds the player gets disconnected and finally automatically folding the hand and losing the pot.